When 5times a number is increased by 10, the answer is the same as when 100 is decreased by the number. What is the number?
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As in each table can seat 8 people and the probability you need to find is about the first person you can ignore this data.
Probability that the first person to enter the room will be randomly seated at a maple table:
#maple tables: 9
# total tables: 9 +10 +5 +7=31